list_campaigns

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Discloses read-only nature, authentication requirement, returned fields, pagination behavior with default and max limit, and explicitly states what is not returned (performance metrics).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with all critical information front-loaded; no unnecessary words, efficient use of space.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Fully describes return value (fields listed), excludes performance metrics, notes authentication, and covers pagination details. No missing information for a list tool without output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Input schema has 100% coverage with descriptions; the description reiterates filter and pagination options but does not add new semantic meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description explicitly states the tool lists campaigns in the Apple Search Ads organization, specifies the resource and scope, and distinguishes from sibling tool get_campaign_report by noting it returns metadata not performance metrics.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides clear guidance on when to use this tool (for campaign metadata) and when to use an alternative (get_campaign_report for metrics), along with optional filtering and pagination details.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.